<template>
	<div class="goods">
		<div class="menu-wrapper" v-el:menu-wrapper>
			<ul>
				<li v-for="item in goods" class="menu-item" :class="{'current':currentIndex===$index}" @click="selectMenu($index,$event)">
					<span class="text border-1px"><span v-show="item.type > 0" class="icon" :class="classMap[item.type]"></span>{{item.name}}</span>
				</li>
			</ul>
		</div>
		<div class="foods-wrapper" v-el:foods-wrapper>
			<ul>
				<li v-for="item in goods" class="food-list food-list-hook">
					<h1 class="title">{{item.name}}</h1>
					<ul>
						<li v-for="food in item.foods" class="food-item" @click="selectFood(food, $event)">
							<div class="icon">
								<img :src="food.icon" width="57" height="57">
							</div>
							<div class="content">
								<h2 class="name">{{food.name}}</h2>
								<p class="desc">{{food.description}}</p>
								<div class="extra">
									<span class=".count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
								</div>
								<div class="price">
									<span class="now">￥{{food.price}}</span><span v-show="food.oldPrice" class="old">￥{{food.oldPrice}}</span>
								</div>
								<div class="cartcontrol-wrapper">
									<cartcontrol :food="food"></cartcontrol>
								</div>
							</div>
						</li>
					</ul>
				</li>
			</ul>
		</div>
		<shopcart v-ref:shopcart :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice" :select-foods="selectFoods"></shopcart>
	</div>
	<food :food="selectedFood" v-ref:food></food>
</template>
<script>
	import BScroll from 'better-scroll';
	import shopcart from 'components/shopcart/shopcart';
	import cartcontrol from 'components/cartcontrol/cartcontrol';
	import food from 'components/food/food';
	const ERR_OK = 0;
	export default {
		props: {
			seller: {
				type: Object
			}
		},
		data () {
			return {
				goods: [],
				listHeight: [],
				scrollY: 0,
				selectedFood: {}
			};
		},
		computed: {
			currentIndex () {
				for (let i = 0; i < this.listHeight.length; i++) {
					let height1 = this.listHeight[i];
					let height2 = this.listHeight[i + 1];
					if (!height2 || this.scrollY >= height1 && this.scrollY < height2) {
						return i;
					}
				}
				return 0;
			},
			selectFoods () {
				let foods = [];
				this.goods.forEach((good) => {
					good.foods.forEach((food) => {
						if (food.count) {
							foods.push(food);
						}
					});
				});
				return foods;
			}
		},
		created () {
			this.classMap = [ 'decrease', 'discount', 'special', 'invoice', 'guarantee' ];
			this.$http.get('api/goods').then((response) => {
				response = response.body;
				if (response.errno === ERR_OK) {
					this.goods = response.data;
					this.$nextTick(() => {
						this._initScroll();
						this._calculateHeight();
					});
				}
			});
		},
		methods: {
			selectMenu (index, event) {
				if (!event._constructed) {
					return;
				}
				let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook');
				let el = foodList[index];
				this.foodsScroll.scrollToElement(el, 300);
			},
			selectFood (food, event) {
				if (!event._constructed) {
					return;
				}
				this.selectedFood = food;
				this.$refs.food.show();
			},
			_drop (target) {
				// 体验优化,异步执行下落动画
				this.$nextTick(() => {
					this.$refs.shopcart.drop(target);
				});
			},
			_initScroll () {
				this.menuScroll = new BScroll(this.$els.menuWrapper, {
					click: true
				});
				this.foodsScroll = new BScroll(this.$els.foodsWrapper, {
					click: true,
					probeType: 3
				});
				this.foodsScroll.on('scroll', (pos) => {
					this.scrollY = Math.abs(Math.round(pos.y));
				});
			},
			_calculateHeight () {
				let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook');
				let height = 0;
				this.listHeight.push(height);
				for (let i = 0; i < foodList.length; i++) {
					let item = foodList[i];
					height += item.clientHeight;
					this.listHeight.push(height);
				}
			}
		},
		components: {
			shopcart,
			cartcontrol,
			food
		},
		events: {
			'cart.add' (target) {
				this._drop(target);
			}
		}
	};
</script>
<style lang="scss" rel="stylesheet/scss">
	@import '../../common/sass/mixin.scss';
	.goods{
		display: flex;
		position: absolute;
		top: 174px;
		bottom: 46px;
		width: 100%;
		overflow: hidden;
		.menu-wrapper{
			flex: 0 0 80px;
			width: 80px;
			background: #f3f5f7;
			.menu-item{
				display: table;
				height: 54px;
				width: 56px;
				padding: 0 12px;
				line-height: 14px;
				&.current{
					position: relative;
					z-index: 10;
					margin-top: -1px;
					background: #fff;
					font-weight: 700;
					.text{
						@include border-none;
					}
				}
				.icon{
					display: inline-block;
					vertical-align: top;
					width: 12px;
					height: 12px;
					margin-right: 2px;
					background-size: 12px 12px;
					background-repeat: no-repeat;
					&.decrease{
						@include bg-image("decrease_3");
					}
					&.discount{
						@include bg-image("discount_3");
					}
					&.guarantee{
						@include bg-image("guarantee_3");
					}
					&.invoice{
						@include bg-image("invoice_3");
					}
					&.special{
						@include bg-image("special_3");
					}
				}
				.text{
					display: table-cell;
					width: 56px;
					vertical-align: middle;
					@include border-1px(rgba(7, 17, 27, 0.1));
					font-size: 12px;
				}
			}
		}
		.foods-wrapper{
			flex: 1;
			.title{
				padding-left: 14px;
				height: 26px;
				line-height: 26px;
				border-left: 2px solid #d9dde1;
				font-size: 12px;
				color: rgb(147, 153, 159);
				background: #f3f5f7;
			}
			.food-item{
				display: flex;
				margin: 18px;
				padding-bottom: 18px;
				@include border-1px(rgba(7, 17, 27, 0.1));
				&:last-child{
					@include border-none;
					margin-bottom: 0;
				}
				.icon{
					flex: 0 0 57px;
					margin-right: 10px;
				}
				.content{
					flex: 1;
					.name{
						margin: 2px 0 8px 0;
						height: 14px;
						line-height: 14px;
						font-size: 14px;
						color: rgb(7, 17, 27);
					}
					.desc,.extra{
						line-height: 10px;
						font-size: 10px;
						color: rgb(147, 153, 159);
					}
					.desc{
						margin-bottom: 8px;
						line-height: 12px;
					}
					.extra{
						.count{
							margin-right: 12px;
						}
					}
					.price{
						font-weight: 700;
						line-height: 24px;
						.now{
							margin-right: 8px;
							font-size: 14px;
							color: rgb(240, 20, 20);
						}
						.old{
							text-decoration: line-through;
							font-size: 10px;
							color: rgb(147, 153, 159);
						}
					}
					.cartcontrol-wrapper{
						position: absolute;
						bottom: 12px;
						right: 0;
					}
				}
			}
		}
	}
</style>